rpistoresi 0 Report post Posted March 19, 2019 When I try to activate my Nitro Pro 11 I get an "-23:Error - License number already used" message but only used 7 of the 10 serial numbers purchased have been activated according to the license portal. Any advice on how to resolve this issue? Share this post Link to post Share on other sites
rpistoresi 0 Report post Posted March 20, 2019 This topic has been resolved. It turns out that Pro 11 serials are retired and replaced by Pro 12 and were sent to the purchaser of these serials. Thank you. Share this post Link to post Share on other sites
